@Book{xie2015,
  title = {Dynamic Documents with {R} and knitr},
  author = {Yihui Xie},
  publisher = {Chapman and Hall/CRC},
  address = {Boca Raton, Florida},
  year = {2015},
  edition = {2nd},
  note = {ISBN 978-1498716963},
  url = {http://yihui.name/knitr/},
}
@book{舒华2015,
  title={心理与教育研究中的多因素实验设计},
  author={舒华},
  year={2015},
  address = {北京},
  publisher={北京师范大学出版社}
}
